[Elecraft] Sub RX Filters choice

[mm0gpz]

Hi.

My K3 has a standard 2.7 Khz ssb filter, a narrow 2.1 Khz ssb filter and a
400 hz cw filter.


I am planning to purchase the sub RX KRX3 and would like some filter advice
please. I am much more interested in CW.

Do I have to match up all these filters on the Sub RX for diversity? I know
the 2.7 Khz is standard but for diversity I seem to remember reading the
same filters should be in place? I also seem to recall that the filters are
not cascaded so in essence, only one filter is in line at a time. So if I
purchase only the 400 hz filter for the sub RX, it diversity reception will
work fine as long as the 400 hz filter is selected for CW or SSB will be
fine between > 2100 and 2700?

What would happen if I engaged the 2.1 SSB filter in main RX and I don't
have same filter in Sub RX.

Thanks for your time.


Gordon
MM0GPZ